Does mercuric sulphide dissolve in sodium sulphide solution (of `2M`)?

Explanation

To determine whether mercuric sulphide (HgS) dissolves in a sodium sulphide (Na2S) solution of 2M concentration, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**:
- Mercuric sulphide (HgS) is the compound in question.
- Sodium sulphide (Na2S) is the solution we are testing against.

...